Improvement in guard for door-kets



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HENRY A. ADAMS, OF NEW YORK, N. Y., A-SSIGNOR TO v[-IIMSELF AND G. E. HILL, OF SVAMEPLACE.

Laim Patent No. 86,797, ma February 9, 1869.

The Schedule referred to in these Letters Patent and making part o f the Bama.

` To all whom it may concern:

Be it known that I, HENRY A. ADAMs, of the city,

county, and State of New York, have invented a nem, `and improved Burglar and Spy-Proof Key-Guard; and I do hereby declare that the following is a full and exact description thereoreference being had to the accompanying drawings, forming part of this specification,

and to the letters of reference marked thereon.

The object of my invention is to provide a burglar and spy-proof key-guard for the use of guests of hotels -and boarding-houses, for their protection against burg lars and hotel-thieves, and also for all residents, for the same purpose.

The nature of my invention consists in providing a straight bar, which may be either square, round, or octagonal, upon one end of which is a cross-head'that is designed to enter the key-hole under the key. Uponl this bar is another `cross-head, made to fit closely, but so as to move freely backward and forward upon the said Y bar, which, when in' proper position, may be fixed in its place by' means of a thumb-screw, with which it is provided, and also a movable disk, which is designed to cover the key-hole. v

At each end of the movable cross-heads are hooks `secured by means of a hinge or joint, so as to allow them to move, so that, taking the cross-head and hooks together, they form a sort of bifurcated movable crosshead, and when the key is introduced into the ,key-

hole, and the stationary cross-head, and a spike or prong on the face ofthe disk, are also introduced, the shank of the key resting on a notch or slot provided on the Aedge of the disk, these hooksV are introduced into the ring or bow of the key, and when thus engaged it is impossible to turn the key from the oppo? site side of the door, while the movable disk 4being now close to the key-hole, renders it impossible for a pereach ofthe figures.

A represents a straight steel bar, or it may be made of any suitable metals and of proper dimensions.

At one` end of the said bar A, is a cross-head, B,

made so as to enable it to enter through the key-hole, underneath the key, after the key has been turned partially round out of the way, so as to allow the crosshead B to enter the lo'ck.

C is the movable cross-head, to which are attached the hooks D D, by any 'suitable joint or hinge, E, and which may be iirmly secured to the bar A by means of the thumb-screw F, when the said cross-head has been adjusted by moving it along the bar A, so as to correspond with the length of the key G, to which it may be desired to'attach it'.

I is a movable disk placed upon the barA., provided.

with a notch, K, in which the shank of .the key rests, and a spike or prong, L, designed to enter the key-hole. It will be seen that when the key G has been inserted into the key-hole', inside the door, and turned so as to lock the door, the cross-head Bis placed within the key-hole as far as it will go; the bar A is then brought head B, when the cross-head C is firmly ixed to the bar A by means of the thumbscrew F. The guard is then in position, and it will be found impossible for a person outside the door to turn the key in the lock, or to push it out, ,or to introduce any implement intoA the key-hole with which to pick the lock, while the disk I will so cover the key-hole as' to prevent the possibility of seeing into 4the room through the keyhole from without. i

The advantages of my invention will be readily seen, `for the reason that it is cheap and simple in its construction, andjcan be carried in the pocket or elsewhere without inconvenience, while it is well adapted for the purpose for which itfis designed, and canbeapplied ,Witnesses J. C. LAWRENCE, JOHN S. THORNTON. 

